Safety-gate for pivot-bridges



(No Model.) 2 SheetsSheet 1.

J. H. QUAOKENBUSH.

SAFETY GATE FOR PIVOT BRIDGES.

No. 321,249. PatentedJuneBO, 1885,

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NITED STATES PATENT rFicE.

JESSE H. QUAGKENBUSH, OF EAST SAGINAW, MICHIGAN.

SAFETY-GATE FOR PIVOT-BRIDGES.

SPECIFICATION forming part of Letters Patent No. 321,249, dated June 30,1885.

Application filed February 25, 1884. (No model.)

T 0 all whom it may concern:

Be it known that I, Jnssn H. QUAOKEN- BUSH, acitizen of the UnitedStates, and a resident of East Saginaw, Saginaw county, Michigan, haveinvented certain Improvements in Safety-Gates for Pivot-Bridges, ofwhich the following is. a specification.

My invention consists of certain improvements in mechanism for causingthe closing of the roadways on the permanent parts of a bridge structurewhen a pivot-bridge connected therewith is opened, and for removing theobstructions when the pivot-bridge is closed.

In the accompanying drawings, Figure 1, Sheet 1, is a diagram drawn to areduced scale and showing a pivot-bridge and parts of the permanentbridge structure; Fig. 2, a plan view drawn to a larger scale of partsof the permanent structure; Fig. 3, a vertical section on the line 1 2,Fig. 2; Fig. 4, Sheet 2, a vertical section on the line 3 4, Fig. 2;Fig. 5, a perspective diagram, partly in section, and illustrating myinvention.

It should be understood in the outset that there has been no attempt toillustrate the detailed construction of the pivot-bridge or permanentportions of the structure,for the reason that these may be constructedin different ways without departing from the main feature of myinvention, and for the further reason that elaborate details of thestructure would lead to confusion.

A, Fig. 1, is the pivot-bridge, and B B the permanent parts of thebridge structure, the ends of the pivot-bridge being made, as usual, inthe arc of a cirele,of which the pivot is the center,and the ends of thepermanent portions of the structure being made to correspond with therounded ends of the pivot-bridge.

To stands D D on each permanent portion of the structure are pivoted thearms E E, one to each stand, and each arm may be counterbalanced byaweight secured to the extension (4 of the arm. A weight, F, is attachedto one end of a chain, 1), a suitable pit being made in the permanentportion of" the structure to receive this weight. The chain passes overasprocket-wheel, e, on the arm, the said wheel being concentric with thearms pivotpin and the chain passing downward from the sprocket-wheel andround a guiding-pulley, f, and being secured to a central lever, G,whichis pivoted at 00 to any suitable attachment on the under side of thepermanent structure, the lever being so adapted to guides h that it canresist lateral strai'ns.- Both arms E are connected by chains to thecentral lever, G, in precisely the same way; but in applying myinvention to a narrow bridge one arm with chain-connections to the saidlever G will suffice. On the under side of the pivot-bridge is a beam,H, the under edge of which presents two inclined planes, so that inclosing the bridge after it has been opened one of these inclined planeswill so depress the lever G as to raise both arms E E, the weights,however, depressing the arms when the pivotbridge is opened.

I am aware that pivoted gates on the approaches to a pivoted bridge havebeen combined with such mechanism that they will be closed when thebridge is opened and opened when the bridge is closed; hence I claim asmy invention The combination of a pivot-bridge having a cam orprojection, H, an arm or gate, E, pivoted to the permanent portion ofthe struct ure, and a lever, G, beneath the same, with a chain, 1),attached at one end to the lever, passingover a sprocket-wheelconcentric with the pivot-pin of the said arm or gate, and weighted atits opposite end, all substantially as set forth. 7 p

In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing witnesses.

JESSE H. QUAGKENBUSH.

Witnesses:

E. N. STONE, B111). HAAQK.

